Hi all, I live in MN and we get some pretty cold winters. I've noticed on the North side of my house, which is shaded all winter, I get frost on the inside of some of my window frames when it's -20 deg F or colder. It appears this has been happening for awhile (this is my first year in this house), because I the wood is discolored in the areas where there was frost during the winter. What is the proper way to handle this type of situation? Can i sand and restain or something? I'm hoping I can avoid a total window replacement, as thats more money than i have a budget for right now. Thanks for any ideas!